Radio receiving apparatus



sea. 22, 1936.

RADIO RECEIVING APPARATUS Filed Dec 7, 1955 BET. lsr AUDIO Q -i /5 y aINVENT OR. lfy- [aw/w 'AfiK f) BY I a Z ATTORNEY.

Patented Sept. 2 2, 1936 RADIO RECEIVING APPARATUS Edmond Peter Garvey,Springfield, Mass, as-

signor to United American Bosch Corporation, Springfield, Mass, acorporation of New York Application December I, 1935, Serial No. 53,361

3 Claims.

This invention relates to radio apparatus and more particularly to acombination unit and associated circuit. In the past it has beencustomary to provide individual units in radio circuits and connect themin circuit by numerous wires and solder joints. All these componentparts require considerable space and render it difficult to securereceiver designs which are satisfactory in physical arrangement andelectrical performance.

An object of this invention is to provide radio apparatus which issimple in construction and more efficient in operation.

Another object is to provide radio apparatus which is more compact indesign and which requires less associated wiring.

A further object is to provide radio apparatus which is more economicalin production and installation.

Other objects and advantages will in part be set forth and in part beobvious when the following specification is read in connection with thedrawing, in which:

Fig. 1 is a front elevation of the combination transformer and multiplecondenser unit; Fig. 2 is a top view showing the arrangement of thevarious condensers; Fig. 3 is an enlarged sectional view of the multiplecondenser unit taken on line 33 of Fig. 2; and Fig. 4 is a circuitdiagram showing one application of the combination transformer andcondenser unit.

Referring in more detail to Fig. 1, the numeral I represents a woodendowel rod carrying the high frequency transformer windings 2. The lowerend of the dowel rod I carries a fibre mount 3 for the terminals 4. Theupper end of the rod I carries a moulded ceramic mount 5 secured by anon-magnetic screw 6 as shown in Fig. 2. The upper surface of the base 5is provided with moulded abutments I, I, 8 and 8'. Between the abutmentsI and I is arranged a multiple condenser consisting of a compressiontype variable condenser and a relatively fixed capacity condenser. Thecondenser structure is shown in greater detail in Fig. 3. An arched,resilient compressor plate 9 is provided at one end with a downwardlyextending connector lug ID. A first intermediate plate II has aconnector lug I2 depending from one side thereof near the end. Thesecond intermediate plate I3 has a connector lug I4 which is designed tocontact the lug ID of the compressor plate 9. The bottom plate isprovided with a connector lug I6. Between each plate is an insulatingstrip I1 of mica or any suitable material. Centrally of each member ofthe condenser stack is a hole through which a compression screw I8extends, as shown in Fig. 1. A washer I9 provides a thrust surfaceagainst the compression plate 9. It will be apparent that plates 9 andI3, being connected together, form one side of a variable condenser,with the first intermediate plate II forming the other side. A secondcondenser is formed between plates I 5 and [3 which varies somewhat invalue under different degrees of compression, but which providessufficient capacity for by-pass and other non-critical uses. Between theabutments 8 and 8' (Fig. 2) is located another three plate variablecondenser 20 which is similar in construction to the previouslyexplained variable condenser formed by plates 9 and I3 and plate I I. Afixed resistance 2| may be soldered directly to the connector lugs I0and I4 as shown in Fig. 1.

A circuit is shown in Fig. 4, to which the described unit isparticularly suited. From a suitable source, a high frequency signal isapplied across the primary of transformer 2, which is tuned by thevariable condenser 20. The secondary of transformer 2 is connectedbetween the diode plates 22 and cathode 23 of a combined detector andfirst audio tube 24, commercially known as type I5. The secondary oftransformer 2 is tuned by the variable condenser formed by plate II andplates 9 and I3. The plate I5 is connected to ground and forms withplate I3 a condenser which acts as a filter to by-pass to ground theunwanted component of rectification in the diode circuit. Suchcondensers are usually provided as a separate unit of considerable bulkand requiring both some form of support and considerable wiring. Sincethe remaining portions of the diagram are well known and form no part ofthe present invention, they will not be explained in further detail. Byproceeding in the manner described a multiple condenser unit of greaternumber of sections may readily be procured without appreciablyincreasing the size of the combination.

It will be obvious that many alterations and modifications may be madein the described invention by anyone skilled in the art withoutdeparting from the spirit and scope of the invention as defined in thefollowing claims.

What is claimed is:

1. A radio transformer comprising an insulating core, windings on saidcore, a ceramic support secured to one end of said core, two tuningcondensers mounted on said support and connected to said windings, and athird condenser supported adjacent one of said tuning condensers havingone side in common therewith.

2. A radio transformer comprising an insulating core, windings on saidcore, a. ceramic support secured to one end of said core, abutmentsformed on the top surface of said support, a stack having condenserplates retained in alignment by said abutments, and meansinterconnecting said plates whereby .a portion thereof forms onecondenser and the remainder forms a second condenser.

and

3. A radio transformer comprising an insulating core, windings on saidcore, a ceramic support secured to one end of said core, abutmentsformed on the top surface of said support, a

stack comprising at least four condenser plates 5 a and being retainedin alignment by said abutments, and connections whereby three of saidplates form one condenser with the remainder forming a second-condenserhaving one side in common withsaid first --condenser.

EDMOND PETER GARVEY.

DISCLAIMER 2,055,431.Edm0nd Pete?" Garvey, Springfield, Mess. RADIORECEIVING APPA- RATUS. Patent dated September 22, 1936. Disclaimer filedApril 4, 1938, by the essignee, United American Bosch Corporation.Hereby enters this disclaimer to claims 1 and 2 of said patent.

[Ofiicial Gazette April 26, 1938.]

DISCLAIM ER 2,055,431.Edm0nd Peter Garvey, Springfield, Mass. RADIORECEIVING APPA- RATUS. Patent dated September 22, 1936. Disclaimer filedApril 4, 1938, by the assignee, United American Bosch Corporation.Hereby enters this disclaimer to claims 1 and 2 of said patent.

[Ofiicial Gazette April 26, 1938.]

